The Search for Neutrino Oscillations numubar->nuebar with KARMEN

Abstract

The neutrino experiment KARMEN is situated at the beam stop neutrino source ISIS. It provides numu's, nue's and numubar's in equal intensities from the pi+ mu+ decay at rest (DAR). The oscillation channel numub->nueb is investigated in the appearance mode with a 56t liquid scintillation calorimeter at a mean distance of 17.7m from the nu source looking for p(nue,e+)n reactions. The cosmic induced background for this oscillation search could be reduced by a factor of 40 due to an additional veto counter installed in 1996. In the data collected through 1997 and 1998 no potential oscillation event was observed. Using a unified approach to small signals this leads to an upper limit for the mixing angle of sin**2(2t) < 1.3x10^{-3} (90%CL) at large Dm**2. The excluded area in (sin**2(2t),Dm**2) covers almost entirely the favored region defined by the LSND numub->nueb evidence.

Proceedings Contribution to Neutrino98 in Takayama, Japan, June 4-9, 1998; 13 pages, including 4 figures

References in corpus (5)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Evidence for Neutrino Oscillations from Muon Decay at Rest
• A High Statistics Search for muon-neutrino(anti-muon-neutrino) ---> electron-neutrino(anti-electron-neutrino) Oscillations in the Small Mixing Angle Regime
• KARMEN Limits on nu_e -> nu_tau Oscillations in 2-neutrino and 3-neutrino Mixing Schemes
• Measurement of the energy spectrum of ν_e from muon decay and implications for the Lorentz structure of the weak interaction

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